基于试验的大型单立柱广告牌结构设计风荷载研究

Wind Load Study on Structural Design of Large Single-column Billboard Based on Wind Tunnel Tests

大型户外广告牌作为城市典型的风灾易损性结构,在强风作用下的毁坏倒塌发生频繁,存在巨大的安全隐患。目前的国内外现有规范仅给出了单面板广告牌的抗风设计方法,对于形式多样,气动外形各异的多面板广告牌结构已不尽适用。本文通过刚性模型表面同步测压以及气动弹性模型测振试验,对单立柱多面广告牌面板局部风压体型系数、风力体型系数和风振系数进行研究,得出单立柱广告牌风振系数的简化计算方法,并与现有规范风荷载参数进行了对比分析。为提高我国大型广告牌结构的抗风可靠性提供了详实的试验数据,也为相关风荷载设计规范的修订提供了重要参考。

As a typical wind vulnerability structure in urban,the large outdoor billboards are frequently reported to be damaged or even collapsed under strong wind,which results in a huge potential safety risk.At present,the existing wind load standards only provide the design loads design for single-plate billboard,which is not suitable for the multi-plate billboards with various forms and different aerodynamic shapes.In this paper,the series of wind tunnel testing on a rigid model by synchronous pressure measurement technique,as well as the vibration measurement testing on an aero-elastic model by basement force measurement technique were carried out.The proposed value of local wind pressure coefficient,force coeficient and wind vibration factor were provided for the wind-resistant design loading on the plates connection,plate support system and the supporting column of single column billboard structure respectively,and were compared with the existing wind load specification.This study not only provides basical data for improving the wind-resistant reliability of large billboard structure,but also provides an important reference for the future revision of the relevant wind load specification of the large outdoor billboards.